Polymer paperSynthesis of polymers and copolymers of c-(Nϵ-AcrLys-Gly) and interactions with metal ions in solution
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AbstractA vinyl compound carrying a cyclic dipeptide in the side chain, c-(Nϵ-AcrLys-Gly), has been synthesized and polymerized using radical initiators. The homopolymer was soluble only in water, Me2SO, H2OMe2SO and H2OHCONMe2. In the latter solvent, an initially clear solution became turbid upon standing. Copolymers with styrene were prepared and a styrene-rich fraction was found to be soluble in a variety of organic solvents. However, the reduced viscosity of a HCONMe2 solution of the copolymer increased with dilution. CH2Cl2-soluble copolymers extracted barium picrate and NaBPh4 from aqueous solution, and copolymer gels swollen in dioxane bound NaBPh4 effectively. Metal salt binding should have resulted from the ion-dipole interaction between Ba2+ or Na+ and cyclic dipeptides. However, the polymer effect due to the intramolecular cooperation of cyclic dipeptides upon ion binding was not quantitatively estimated.

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